The UK’s EU referendum: the economic arguments

Many of the arguments used by both sides in the referendum debate centre on whether there will be a net economic gain from either remaining in or leaving the EU. This involves forecasting.

Forecasting the economic impact of the decision, however, is difficult, especially in the case of a leave vote, which would involve substantial change and uncertainty.

First, the effects of either remaining or leaving may be very different in the long run from the short run, and long-run forecasts are highly unreliable, as the economy is likely to be affected by so many unpredictable events – few people, for example, predicted the financial crisis of 2007–8.

Second, the effects of leaving depend on the nature of any future trading relationships with the EU. Various possibilities have been suggested, including ‘the Norwegian model’, where Britain leaves the EU, but joins the European Economic Area, giving access to the single market, but removing regulation in some key areas, such as fisheries and home affairs. Another possibility is ‘the Swiss model’, where the UK would negotiate trade deals on an individual basis. Another would be ‘the Turkish model’ where the UK forms a customs union with the EU. At the extreme, the UK could make a complete break from the EU and simply use its membership of the WTO to make trade agreements.

Nevertheless, despite the uncertainty, economists have ventured to predict the effects of remaining or leaving. These are not precise predictions for the reasons given above. Rather they are based on likely assumptions.

In a poll of 100 economists for the Financial Times, ‘almost three-quarters thought leaving the EU would damage the country’s medium-term outlook, nine times more than the 8 per cent who thought the country would benefit from leaving’. Most fear damage to financial markets in the UK and to inward foreign direct investment.

Despite the barrage of pessimistic forecasts by economists about a British exit, there is a group of eight economists in favour of Brexit. They claim that leaving the EU would lead to a stronger economy, with higher GDP, a faster growth in real wages, lower unemployment and a smaller gap between imports and exports. The main argument they use to support their claims is that the UK would be more able to pursue trade creation freed from various EU rules and regulations.

Then, less than four weeks before the vote, a poll of economists who are members of the Royal Economic Society and the Society of Business Economists came out strongly in favour of continued membership of the EU. Of the 639 respondents, 72 per cent thought that the most likely impact of Brexit on UK real GDP would be negative over the next 10 to 20 years; and 88 per cent thought the impact on GDP would be negative in the next five years (see chart: click to enlarge).

Of those stating that a negative impact on GDP in the next 5 years would be most likely, a majority cited loss of access to the single market (67%) and increased uncertainty leading to reduced investment (66%).

International organisations, such as the OECD, the IMF and the WTO, also argue that leaving the EU would create great uncertainty over future trade relations and access to the Single Market and would reduce inward foreign direct investment and the flow of skills.

But the forecasts of all these organisations depend on their assumptions about trade relations and that, in the event of the UK leaving the EU, would depend on the outcome of trade negotiations. The Leave campaign argues that other countries would want to trade with the UK and that therefore leaving would not damage trade. The Remain campaign argues that the EU would not wish to be generous to the UK for fear of encouraging other countries to leave the EU and that, anyway, the process of decoupling from the EU and negotiating new trade deals would take many years and, in the meantime, the uncertainty would be damaging to investment and growth.

The articles linked below looks at the economic arguments about Brexit and reflect the range of views of economists. Several are from ‘The Conversation’ as these are by academic economists. Although some economists are in favour of Brexit, the vast majority support the Remain side in the debate.